Octopus Energy, a UK-based energy provider, has launched a new initiative called Zero Bills Homes in Guichen-Pont-Réan, a commune located in the southern part of Rennes, France. This program involves the construction of about 100 single-family homes that will not require electricity bills for at least 10 years. The project is part of the redevelopment of the Massaye estate, a former site abandoned in 2005 that has become a point of interest for urban explorers. The historic castle on the site, built in 1630, will be renovated to support professional and community services, while the 100 homes will be built in a 9-hectare park surrounding the area. The Zero Bills Homes program uses a combination of modern technologies to achieve its goal. Each home will be equipped with heat pumps to provide heating and hot water, solar panels to generate electricity, and home batteries to store excess energy. These systems will be managed remotely by Octopus Energy to maximize the use of self-generated power. Insulation will also be a key factor in minimizing the need for heating. While the electricity used in the homes will be free, charging electric vehicles will remain an additional cost. To prevent excessive energy use, a consumption limit has been set—any electricity used beyond this threshold will be billed. The ten-year electricity-free period applies to the initial homes, with later homes having guaranteed periods ranging from five to ten years. The eco-district will include wooden-frame homes, prefabricated in Finistère, offering a range of housing types from T1 (one-room apartments) to T5 (larger family homes), with prices ranging from €75,000 to €311,000. The first homes are expected to be completed by early 2028. If successful, Octopus Energy plans to roll out similar projects in the near future, aiming to reach 15,000 Zero Bills Homes by 2030. In addition to the Guichen-Pont-Réan project, the company has partnered with developer LMO.IMMO to create another eco-district called "Les Toupes" in Bletterans, in the Jura region, where 83 homes will be built using the same principles.